Concept of the Systemquant and Work Operation Analysis
In normal occupational physiology, any work operation is viewed through the lens of systemquants—basic units of production activity that lead to a specific intermediate result. To assess how the body supports these units, researchers analyze the dynamics of heart rate (HR) at different stages of work.
A classic experimental example is the industrial operation of welding a plate to a cylinder. This process can be divided into clear sequential phases:
- Phase 1: Picking up a new workpiece (initial stage).
- Phases 2–5: Direct welding of the plate (the main, most critical part of the operation).
- Phase 6: Discarding the finished product (cycle completion).
When comparing the pulse curves of an experienced master and a novice worker performing identical actions, we see completely different patterns of autonomic support. The graphs clearly demonstrate that heart rate fluctuates in strict dependence on the current stage of the work operation, but the amplitude and nature of these fluctuations differ radically between specialists of varying skill levels.
Physiological Profile of a Novice Worker
Novice workers demonstrate a number of specific physiological features directly related to a lack of practical experience. First, the time factor suffers: the duration of a single systemquant is significantly longer for them compared to professionals. This indicates a low work speed and suboptimal distribution of physical effort.
- Second, novices lack basic coordination of critical life-support systems. In particular, so-called cardiorespiratory coupling is absent. This means that cardiac and respiratory rhythms function disjointedly, without any relative correspondence. The body responds to the work task excessively, unable to adjust breathing to pulse fluctuations, ultimately leading to an uneconomical expenditure of energy even for the simplest elements of the production cycle.
Skill Formation and Autonomic Economy
With training and repeated performance of industrial tasks, a stable work skill is formed. This process is inevitably accompanied by a profound restructuring of somatovegetative parameters at the level of executing each individual systemquant.
The main change upon gaining experience is the development of physiological integration. Body functions begin to tightly synchronize with the actual results of production activity. Thanks to this synchronization, the human body works as economically and harmoniously as possible: the cardiovascular system engages precisely to the extent necessary for a specific phase of work. This delicate alignment of internal processes with the external work task significantly reduces the time spent on a single work cycle. High qualification ensures high productivity at the lowest possible cost of body resources.
Disintegration of Functions Due to Fatigue
Even an ideally formed skill and high qualification can fail under the influence of adverse external and internal factors. Key causes negatively affecting the physiological support of labor are progressive fatigue and pronounced psycho-emotional stress.
Under their prolonged influence, established reactions degrade. Workers exhibit gross disruption of synchronization between physiological functions and the stages of the production process. The body loses its economical mode of operation and falls back onto less optimal response patterns originally characteristic of novices. As a result, the efficiency of autonomic support drops sharply.